Ventilator



H. MOLENDA.

V VENTILATOR l APPLICATION FILED APRZSE 1921. 1,430,828, Patented Oct.3, 1922.

Nfl E "rented @et 3i,

til @lill E ratei il nl .t t it i m VENTILATOR.

Application. led April 23,

T all whom t may concern Be it known that l, lrntnr Morrison, a citizenot Poland, residing at llie, in the county of Fallon and State otltlontana, have invented certain new and usetul Improvements in`rVentilators, of which the following is a specilication.

The main object of this invention is the provision oLl a ventilator fanhaving means for closely regulating the draft thereof.

rlhe above and other objects will become apparent in the descriptionbelow, in which same characters of reference reiter to saine parts inthe drawings.

Referring briefly to the drawing, Fig. l is a 'iront elevational view,partly in section, of the device, in wide open position.

Fig. 2 is a side elevational view, partly in section, ot the same.

llig. 3 is a trent elevational view or the same in maximum shut-ottposition.

Referring now in detail. to the crawings, the numeral l. representsbinders or rivets rigidly connecting, in spaced-apart relation, flatplates and 9, the latter having a circular opening 8 therein, and theformer having a similar circular opening surrounded by a cylindricaltube 3 integral withthe plate lfVithin tube 3 are mounted brackets lsupported upon a cross-bar o, said brackets l having bearings therein inwhich is rotatably supported a shaft '7 upon which is mounted apropeller ta-n 6.

Shutters l0 ot the form shown are pivotally mounted at ll between theplates 2 and 9, and have small drums 12 rigid thereto about the pivotalaxes. Cables l-S have their ends attached to said drums and are woundpartly about the latter, and thence extend in i921. Serial No, 463,987.

proper holes through the plate 9, and are 40 provided at their tree endswith pull rings ll. I

ln operation, the ian 6 may be driven by motor, or may be rotated by thedraft created by the difference in air pressure on opposite sidesthereof. lt is apparent that in order to lessen or increase the draft toany desired degree, it is but necessary to pull the rings le'. By makingthe weight of the rings sutlicient, they may balance the weight 5o ofthe shutters in any position of the latter.

l claim:

l. A device ot the class described comprising a pair ot spaced apartplates rigidly connected, said plates provided with circular openings, acylindrical tube surrounding one ot said openings and rigid with one ofsaid plates, a fan rotatably mounted in said tube,

a pair oit substantially semi-circular shutters pivotally mountedbetween said plates on different axes, and means Jfor regulating saidshutters to control the opening of said tube.

2,. it device ot the class described comprising a pair of spaced apartplates rigidly connected, said plates provided with circular openings, acylindrical tube rigid with one of said plates and surrounding one ofsaid openings, a tan rotatably mounted in said tube, opposed shutterspivotally mounted be- 7U tween said plates' on different axes, drumsrigid with said shutters about the pivotal aires olE said shutters,flexible cables attached to said drums and partly Wound thereon, saidcables passing out of and below said plates, and rings upon the ends ofsaid cables.

ln witness whereof l atlix my signature.

HENRY MOLENDA.

